Absence of a giant Rashba effect in the valence band of lead halide perovskites

Article

关键词: TANDEM SOLAR-CELLS;    PHASE-TRANSITIONS;    EFFICIENT;    CH3NH3PBI3;    LIGHT;   

DOI  :  10.1103/PhysRevB.102.081116

来源: SCIE

【 摘 要 】

For hybrid organic-inorganic as well as all-inorganic lead halide perovskites a Rashba effect has been invoked to explain the high efficiency in energy conversion by prohibiting direct recombination. Both a bulk and surface Rashba effect have been predicted. In the valence band of methylammonium (MA) lead bromide a Rashba effect has been reported by angle-resolved photoemission and circular dichroism with giant values of 7-11 eV angstrom. We present band dispersion measurements of MAPbBr(3) and spin-resolved photoemission of CsPbBr3 to show that a large Rashba effect detectable by photoemission or circular dichroism does not exist and cannot be the origin of the high effciency.

【 授权许可】

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